Choice® NW 600 is composed of a hydroentangled nonwoven blend of 55% cellulose and 45% polyester. This combination provides Choice® NW 600 with a level of absorbency, abrasion resistance and chemical compatibility required for controlled environments. It’s Choice®. The value tiered category of wipers offering all the performance consistency of higher priced wipers. Best of all, Choice® is from Berkshire, the most trusted name in contamination control products.